#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>

#define log_int(n) printf("%s == %d\n", #n, (n))
#define log_char(n) printf("%s == '%c'\n", #n, (n))
#define log_addr(n) printf("%s == %p\n", #n, (void*)(n))

int main(int argc, char* argv[]) {
    char* str = "Hello World";
    int str_len = 0; // using loop index for size later
    for (; str[str_len] != '\0'; str_len++) {
        log_char(str[str_len]);
        log_addr(str + str_len);
    }
    log_int(str_len); // logical length without the null
                      // character

    char* str_pos = str;
    for (; *str_pos != '\0'; str_pos++) {
        log_char(*str_pos);
        log_addr(str_pos);
    }
    // this gives us some extra validation at the cost
    // of being slightly longer
    int str_len2 = str_pos - str;
    log_int(str_len2);
    // we could have done this, but less validation
    log_int((int)(str_pos - str));

    return EXIT_SUCCESS;
}
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